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1 | /* |
2 | * Driver for TPS65218 Integrated power management chipsets | |
3 | * | |
4 | * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/ | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
11 | * kind, whether expressed or implied; without even the implied warranty | |
12 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License version 2 for more details. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/i2c.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/regmap.h> | |
24 | #include <linux/err.h> | |
25 | #include <linux/of.h> | |
26 | #include <linux/of_device.h> | |
27 | #include <linux/irq.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/mutex.h> | |
30 | ||
31 | #include <linux/mfd/core.h> | |
32 | #include <linux/mfd/tps65218.h> | |
33 | ||
34 | #define TPS65218_PASSWORD_REGS_UNLOCK 0x7D | |
35 | ||
36 | /** | |
37 | * tps65218_reg_read: Read a single tps65218 register. | |
38 | * | |
39 | * @tps: Device to read from. | |
40 | * @reg: Register to read. | |
41 | * @val: Contians the value | |
42 | */ | |
43 | int tps65218_reg_read(struct tps65218 *tps, unsigned int reg, | |
44 | unsigned int *val) | |
45 | { | |
46 | return regmap_read(tps->regmap, reg, val); | |
47 | } | |
48 | EXPORT_SYMBOL_GPL(tps65218_reg_read); | |
49 | ||
50 | /** | |
51 | * tps65218_reg_write: Write a single tps65218 register. | |
52 | * | |
53 | * @tps65218: Device to write to. | |
54 | * @reg: Register to write to. | |
55 | * @val: Value to write. | |
56 | * @level: Password protected level | |
57 | */ | |
58 | int tps65218_reg_write(struct tps65218 *tps, unsigned int reg, | |
59 | unsigned int val, unsigned int level) | |
60 | { | |
61 | int ret; | |
62 | unsigned int xor_reg_val; | |
63 | ||
64 | switch (level) { | |
65 | case TPS65218_PROTECT_NONE: | |
66 | return regmap_write(tps->regmap, reg, val); | |
67 | case TPS65218_PROTECT_L1: | |
68 | xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK; | |
69 | ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD, | |
70 | xor_reg_val); | |
71 | if (ret < 0) | |
72 | return ret; | |
73 | ||
74 | return regmap_write(tps->regmap, reg, val); | |
75 | default: | |
76 | return -EINVAL; | |
77 | } | |
78 | } | |
79 | EXPORT_SYMBOL_GPL(tps65218_reg_write); | |
80 | ||
81 | /** | |
82 | * tps65218_update_bits: Modify bits w.r.t mask, val and level. | |
83 | * | |
84 | * @tps65218: Device to write to. | |
85 | * @reg: Register to read-write to. | |
86 | * @mask: Mask. | |
87 | * @val: Value to write. | |
88 | * @level: Password protected level | |
89 | */ | |
90 | static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg, | |
91 | unsigned int mask, unsigned int val, unsigned int level) | |
92 | { | |
93 | int ret; | |
94 | unsigned int data; | |
95 | ||
96 | ret = tps65218_reg_read(tps, reg, &data); | |
97 | if (ret) { | |
98 | dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); | |
99 | return ret; | |
100 | } | |
101 | ||
102 | data &= ~mask; | |
103 | data |= val & mask; | |
104 | ||
105 | mutex_lock(&tps->tps_lock); | |
106 | ret = tps65218_reg_write(tps, reg, data, level); | |
107 | if (ret) | |
108 | dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); | |
109 | mutex_unlock(&tps->tps_lock); | |
110 | ||
111 | return ret; | |
112 | } | |
113 | ||
114 | int tps65218_set_bits(struct tps65218 *tps, unsigned int reg, | |
115 | unsigned int mask, unsigned int val, unsigned int level) | |
116 | { | |
117 | return tps65218_update_bits(tps, reg, mask, val, level); | |
118 | } | |
119 | EXPORT_SYMBOL_GPL(tps65218_set_bits); | |
120 | ||
121 | int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg, | |
122 | unsigned int mask, unsigned int level) | |
123 | { | |
124 | return tps65218_update_bits(tps, reg, mask, 0, level); | |
125 | } | |
126 | EXPORT_SYMBOL_GPL(tps65218_clear_bits); | |
127 | ||
773328da FB |
128 | static const struct regmap_range tps65218_yes_ranges[] = { |
129 | regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2), | |
130 | regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS), | |
131 | }; | |
132 | ||
133 | static const struct regmap_access_table tps65218_volatile_table = { | |
134 | .yes_ranges = tps65218_yes_ranges, | |
135 | .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges), | |
136 | }; | |
137 | ||
18bb399f | 138 | static const struct regmap_config tps65218_regmap_config = { |
44b4dc61 K |
139 | .reg_bits = 8, |
140 | .val_bits = 8, | |
141 | .cache_type = REGCACHE_RBTREE, | |
773328da | 142 | .volatile_table = &tps65218_volatile_table, |
44b4dc61 K |
143 | }; |
144 | ||
145 | static const struct regmap_irq tps65218_irqs[] = { | |
146 | /* INT1 IRQs */ | |
147 | [TPS65218_PRGC_IRQ] = { | |
148 | .mask = TPS65218_INT1_PRGC, | |
149 | }, | |
150 | [TPS65218_CC_AQC_IRQ] = { | |
151 | .mask = TPS65218_INT1_CC_AQC, | |
152 | }, | |
153 | [TPS65218_HOT_IRQ] = { | |
154 | .mask = TPS65218_INT1_HOT, | |
155 | }, | |
156 | [TPS65218_PB_IRQ] = { | |
157 | .mask = TPS65218_INT1_PB, | |
158 | }, | |
159 | [TPS65218_AC_IRQ] = { | |
160 | .mask = TPS65218_INT1_AC, | |
161 | }, | |
162 | [TPS65218_VPRG_IRQ] = { | |
163 | .mask = TPS65218_INT1_VPRG, | |
164 | }, | |
165 | [TPS65218_INVALID1_IRQ] = { | |
166 | }, | |
167 | [TPS65218_INVALID2_IRQ] = { | |
168 | }, | |
169 | /* INT2 IRQs*/ | |
170 | [TPS65218_LS1_I_IRQ] = { | |
171 | .mask = TPS65218_INT2_LS1_I, | |
172 | .reg_offset = 1, | |
173 | }, | |
174 | [TPS65218_LS2_I_IRQ] = { | |
175 | .mask = TPS65218_INT2_LS2_I, | |
176 | .reg_offset = 1, | |
177 | }, | |
178 | [TPS65218_LS3_I_IRQ] = { | |
179 | .mask = TPS65218_INT2_LS3_I, | |
180 | .reg_offset = 1, | |
181 | }, | |
182 | [TPS65218_LS1_F_IRQ] = { | |
183 | .mask = TPS65218_INT2_LS1_F, | |
184 | .reg_offset = 1, | |
185 | }, | |
186 | [TPS65218_LS2_F_IRQ] = { | |
187 | .mask = TPS65218_INT2_LS2_F, | |
188 | .reg_offset = 1, | |
189 | }, | |
190 | [TPS65218_LS3_F_IRQ] = { | |
191 | .mask = TPS65218_INT2_LS3_F, | |
192 | .reg_offset = 1, | |
193 | }, | |
194 | [TPS65218_INVALID3_IRQ] = { | |
195 | }, | |
196 | [TPS65218_INVALID4_IRQ] = { | |
197 | }, | |
198 | }; | |
199 | ||
200 | static struct regmap_irq_chip tps65218_irq_chip = { | |
201 | .name = "tps65218", | |
202 | .irqs = tps65218_irqs, | |
203 | .num_irqs = ARRAY_SIZE(tps65218_irqs), | |
204 | ||
205 | .num_regs = 2, | |
206 | .mask_base = TPS65218_REG_INT_MASK1, | |
f29ae369 | 207 | .status_base = TPS65218_REG_INT1, |
44b4dc61 K |
208 | }; |
209 | ||
210 | static const struct of_device_id of_tps65218_match_table[] = { | |
211 | { .compatible = "ti,tps65218", }, | |
8320513e | 212 | {} |
44b4dc61 K |
213 | }; |
214 | ||
215 | static int tps65218_probe(struct i2c_client *client, | |
216 | const struct i2c_device_id *ids) | |
217 | { | |
218 | struct tps65218 *tps; | |
219 | const struct of_device_id *match; | |
220 | int ret; | |
221 | ||
222 | match = of_match_device(of_tps65218_match_table, &client->dev); | |
223 | if (!match) { | |
224 | dev_err(&client->dev, | |
225 | "Failed to find matching dt id\n"); | |
226 | return -EINVAL; | |
227 | } | |
228 | ||
229 | tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); | |
230 | if (!tps) | |
231 | return -ENOMEM; | |
232 | ||
233 | i2c_set_clientdata(client, tps); | |
234 | tps->dev = &client->dev; | |
235 | tps->irq = client->irq; | |
236 | tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config); | |
237 | if (IS_ERR(tps->regmap)) { | |
238 | ret = PTR_ERR(tps->regmap); | |
239 | dev_err(tps->dev, "Failed to allocate register map: %d\n", | |
240 | ret); | |
241 | return ret; | |
242 | } | |
243 | ||
244 | mutex_init(&tps->tps_lock); | |
245 | ||
246 | ret = regmap_add_irq_chip(tps->regmap, tps->irq, | |
247 | IRQF_ONESHOT, 0, &tps65218_irq_chip, | |
248 | &tps->irq_data); | |
249 | if (ret < 0) | |
250 | return ret; | |
251 | ||
252 | ret = of_platform_populate(client->dev.of_node, NULL, NULL, | |
253 | &client->dev); | |
254 | if (ret < 0) | |
255 | goto err_irq; | |
256 | ||
257 | return 0; | |
258 | ||
259 | err_irq: | |
260 | regmap_del_irq_chip(tps->irq, tps->irq_data); | |
261 | ||
262 | return ret; | |
263 | } | |
264 | ||
265 | static int tps65218_remove(struct i2c_client *client) | |
266 | { | |
267 | struct tps65218 *tps = i2c_get_clientdata(client); | |
268 | ||
269 | regmap_del_irq_chip(tps->irq, tps->irq_data); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | static const struct i2c_device_id tps65218_id_table[] = { | |
275 | { "tps65218", TPS65218 }, | |
276 | { }, | |
277 | }; | |
278 | MODULE_DEVICE_TABLE(i2c, tps65218_id_table); | |
279 | ||
280 | static struct i2c_driver tps65218_driver = { | |
281 | .driver = { | |
282 | .name = "tps65218", | |
283 | .owner = THIS_MODULE, | |
284 | .of_match_table = of_tps65218_match_table, | |
285 | }, | |
286 | .probe = tps65218_probe, | |
287 | .remove = tps65218_remove, | |
288 | .id_table = tps65218_id_table, | |
289 | }; | |
290 | ||
291 | module_i2c_driver(tps65218_driver); | |
292 | ||
293 | MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); | |
294 | MODULE_DESCRIPTION("TPS65218 chip family multi-function driver"); | |
295 | MODULE_LICENSE("GPL v2"); |